U.S. Alerts
El Dorado Weather Logo
U.S. Radar Loop Conditions Map

U.S. Color Satellite North America Color Infrared Animated Satellite Loop

Interactive Wx Map Live U.S. Google Map Radar Thumbnail Image

US Precipitation 1 day, 24 hour precipitation map

US Temperatures US Conditions Map

US Climate Data US Conditions Map

Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 10:41 pm CDT Jun 30, 2026
 
Tonight

Tonight: Mostly clear, with a low around 78. Southwest wind around 10 mph, with gusts as high as 20 mph.
Mostly Clear

Wednesday

Wednesday: Sunny and hot, with a high near 96. Heat index values as high as 104. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Hot

Wednesday
Night
Wednesday Night: Mostly clear, with a low around 80. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Clear

Thursday

Thursday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny and hot, with a high near 96. Heat index values as high as 103. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunny then
Slight Chance
T-storms
Thursday
Night
Thursday Night: A chance of showers and thunderstorms before 4am, then a slight chance of showers.  Partly cloudy, with a low around 76. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.  Chance of precipitation is 30%.
Chance
T-storms

Friday

Friday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm.  Mostly sunny, with a high near 93. Chance of precipitation is 60%.
Showers
Likely

Friday
Night
Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 73. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
Independence
Day
Independence Day: A chance of showers and thunderstorms.  Partly sunny, with a high near 85.
Chance
T-storms

Saturday
Night
Saturday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers.  Mostly cloudy, with a low around 69.
Showers
Likely

Lo 78 °F Hi 96 °F Lo 80 °F Hi 96 °F Lo 76 °F Hi 93 °F Lo 73 °F Hi 85 °F Lo 69 °F

Extreme Heat Warning
Hazardous Weather Outlook
 

Tonight
 
Mostly clear, with a low around 78. Southwest wind around 10 mph, with gusts as high as 20 mph.
Wednesday
 
Sunny and hot, with a high near 96. Heat index values as high as 104. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
 
Mostly clear, with a low around 80. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
 
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 96. Heat index values as high as 103. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
 
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 76. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Friday
 
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 93. Chance of precipitation is 60%.
Friday Night
 
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.
Independence Day
 
A chance of showers and thunderstorms. Partly sunny, with a high near 85.
Saturday Night
 
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 69.
Sunday
 
A chance of showers. Partly sunny, with a high near 83.
Sunday Night
 
Mostly cloudy, with a low around 68.
Monday
 
Mostly sunny, with a high near 84.
Monday Night
 
Partly cloudy, with a low around 67.
Tuesday
 
Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
287
FXUS63 KLOT 010049 CCA
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
616 PM CDT Tue Jun 30 2026

.KEY MESSAGES...

- Dangerous heat wave continues into Thursday, with daytimes
  highs in the low to mid 90s and peak afternoon heat indices of
  100 to 105 degrees (locally higher).

- While not a complete wash out, thunderstorm chances increase
  late Thursday, with a couple of waves of showers and
  thunderstorms expected Friday into the 4th of July weekend.
  Some storms may be severe and produce heavy rainfall.

&&

.DISCUSSION...
Issued at 208 PM CDT Tue Jun 30 2026

The ongoing heat and humidity continues to be the primary weather
story through Thursday.

A persistent upper-level ridge, with H5 heights in excess of
596 DAM, will remain centered across Kentucky and Tennessee
through Wednesday, before gradually expanding eastward towards
the central Atlantic coast for the second half of the week.
Strong capping under this ridge will continue curtail the threat
for showers and thunderstorms locally through at least Thursday
afternoon/evening. Accordingly, unabated diurnal heating of the
very moist low-level airmass will push afternoon high
temperatures in the low to mid 90s (highest in the urban areas
around Chicago) each afternoon through at least Thursday. When
combined with surface dewpoints in the low to mid 70s, heat
indices will again top out in the 100-105 degree range (locally
in excess of 105) both Wednesday and Thursday. Meanwhile, expect
very warm overnight temperatures, with readings likely
struggling to fall out of the low 80s in the city tonight and
again Wednesday night. While such readings are not necessarily
uncommon to experience on a day in the middle of summer in our
area, it is less common to experience such conditions on 4+
straight days with little to no relief. It is thus the
cumulative effects of the heat that is most concerning with this
heat, and not necessarily the peak temperatures and heat
indices on an individual day. Therefore, no changes are planned
to going heat headlines currently in effect.

Wednesday, and much of Thursday, waves of severe thunderstorms
will continue to be favored northwest of our area (from the
Plains northeastward through the Upper Midwest) within a belt of
active west-southwesterly upper-level flow residing along the
west-northwestern periphery of the upper-ridge. However, as the
upper ridge begins to expand eastward, it will allow this active
belt of westerly upper-level flow to shift into our area late
in the week. Accordingly, while our area will get relief from
the extreme heat this weekend, it will come at the price of
increasing chances for showers and thunderstorms. While it will
not be raining and storming constantly, it appears we may end up
with a couple of waves of showers and thunderstorms during the
holiday weekend, most notably late Friday and on Saturday. Some
of these storms could be severe and produce torrential
downpours.

KJB

&&

.AVIATION /00Z TAFS THROUGH 06Z THURSDAY/...
Issued at 616 PM CDT Tue Jun 30 2026

Forecast concern for the terminals...

- Breezy southwest winds early this evening then again Wednesday
  afternoon with gusts around 25-30 kts.


A broad area of high pressure continues to reside over the eastern
CONUS which will allow mostly clear VFR skies and hot conditions to
prevail through the TAF period. However, there is a non-zero chance
(10-15%) for a few MVFR clouds (bases around 2000-2500 ft) to
develop late tonight into Wednesday morning.
Given the low confidence on the coverage and duration of these
lower clouds have opted to maintain the SCT020 in the TAFs for
now.

Otherwise, the main forecast item of note will be the breezy
southwest winds gusting around 25-30 kts early this evening and
again Wednesday afternoon. While gusts will ease overnight, some
occasional 15-17 kt gusts will be possible at times tonight and
again Wednesday night.

Yack

&&

.CLIMATE...
Issued at 1249 AM CDT Tue Jun 30 2026

     .Daily Records for the Upcoming Week........

Chicago (KORD)
            Record High       Record Warm Minimum
June 30       99 (1953)            80 (2018)
July 1       103 (1956)            78 (1931)
July 2        99 (1970)            79 (1911)
July 3       102 (1949)            78 (1911)
July 4       102 (2012)            80 (1921)


Rockford (KRFD)
            Record High       Record Warm Minimum
June 30      102 (1931)            76 (2018)
July 1       101 (1931)            76 (1970)
July 2        99 (1910)            74 (1970)
July 3        99 (1925)            75 (2012)
July 4       102 (2012)            77 (1977)

NWS Chicago

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Extreme Heat Warning until midnight CDT Thursday night for
     ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-ILZ012-
     ILZ013-ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-
     ILZ103-ILZ104-ILZ105-ILZ106-ILZ107-ILZ108.

IN...Extreme Heat Warning until midnight CDT /1 AM EDT/ Thursday
     night for INZ001-INZ002-INZ010-INZ011-INZ019.

LM...Small Craft Advisory until 9 PM CDT this evening for Winthrop
     Harbor IL to Gary IN.

&&

$$

Visit us at weather.gov/chicago
View a Different U.S. Forecast Discussion Location
(In alphabetical order by state)



Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






Contact Us Contact Us Thumbnail | Mobile Mobile Phone Thumbnail
Private Policy | Terms & Conds | Consent Preferences | Cookie Policy
Never base any life decisions on weather information from this site or anywhere over the Internet.
Site is dedicated to our Lord & Savior Jesus Christ | Random Quotes of Jesus

Copyright © 2026 El Dorado Weather, Inc. | Site Designed By:  Webmaster Danny